/*
*   Copyright (c) 1998-2002, Darren Hiebert
*
*   This source code is released for free distribution under the terms of the
*   GNU General Public License version 2 or (at your option) any later version.
*
*   External interface to get.c
*/
#ifndef CTAGS_MAIN_GET_H
#define CTAGS_MAIN_GET_H

/*
*   INCLUDE FILES
*/
#include "general.h"  /* must always come first */

#include "debug.h"
#include "ptrarray.h"
#include "types.h"
#include "vstring.h"

/*
*   MACROS
*/
/* symbolic representations, above 0xFF not to conflict with any byte */
#define CPP_STRING_SYMBOL ('S' + 0xff)
#define CPP_CHAR_SYMBOL ('C' + 0xff)

/*
 * cppIs... macros are for the value returned from cppGetc().  Don't
 * use "char" value. Don't pass a value stored to C-string
 * (char*... or char[]) or vString.
 *
 * cppGetc() can return the value out of range of unsigned char.
 * cppGetc calls skipToEndOfString() and skipToEndOfString() internally.
 * They return STRING_SYMBOL (== 338) and CHAR_SYMBOL (== 322) in a
 * case. (cppGetc() can return EOF (== -1). However, it is not an issue
 * here.)
 *
 * is...() macros/functions defined in ctype.h can handle the value of
 * an unsigned char or EOF; we cannot pass STRING_SYMBOL or CHAR_SYMBOL
 * returned from cppGetc().
 *
 * Depending on the platform, isalpha(338) returns different value.
 * As far as Fedora22, it returns 0. On Windows 2010, it returns 1.
 *
 * So, we need cppIs... macros.
 * cppIs... macros considers STRING_SYMBOL and CHAR_SYMBOL */

#define cppIsascii(c) ((c >= 0) && (c < 0x80))
/* isascii is not portable enough. */

/*  Is the character valid as a character of a C identifier?
 *  VMS allows '$' in identifiers.
 */
#define cppIsalnum(c)  (cppIsascii(c) && isalnum(c))
#define cppIsident(c)  (cppIsalnum(c)					\
						|| (c) == '_' || (c) == '$')

/*  Is the character valid as the first character of a C identifier?
 *  C++ allows '~' in destructors.
 *  VMS allows '$' in identifiers.
 */
#define cppIsalpha(c)   (cppIsascii(c) && isalpha(c))
#define cppIsident1(c)  (cppIsalpha(c)					\
						  || (c) == '_' || (c) == '~' || (c) == '$')

#define cppIsspace(c)   (cppIsascii(c) && isspace(c))
#define cppIsdigit(c)   (cppIsascii(c) && isdigit(c))


#define RoleTemplateUndef { true, "undef", "undefined" }
#define RoleTemplateCondition { false, "condition", "used in part of #if/#ifdef/#elif conditions" }

#define RoleTemplateSystem { true, "system", "system header" }
#define RoleTemplateLocal  { true, "local", "local header" }

typedef enum {
	CPREPRO_MACRO, CPREPRO_HEADER, CPREPRO_PARAM,
} cPreProKind;

/*
*   FUNCTION PROTOTYPES
*/
extern bool cppIsBraceFormat (void);
extern unsigned int cppGetDirectiveNestLevel (void);

/* Don't forget to set useCort true in your parser.
 * The corkQueue is needed to capture macro parameters.
 */
extern void cppInit (const bool state,
		     const bool hasAtLiteralStrings,
		     const bool hasCxxRawLiteralStrings,
		     const bool hasSingleQuoteLiteralNumbers,
		     int defineMacroKindIndex,
		     int macroUndefRoleIndex,
		     int macroConditionRoleIndex,
		     int headerKindIndex,
		     int headerSystemRoleIndex, int headerLocalRoleIndex,
		     int macroParamKindIndex,
		     int macrodefFieldIndex);

extern void cppTerminate (void);
extern void cppBeginStatement (void);
extern void cppEndStatement (void);
extern void cppUngetc (const int c);
extern int cppUngetBufferSize(void);
extern void cppUngetString(const char * string,int len);
extern int cppGetc (void);
extern const vString * cppGetLastCharOrStringContents (void);

/*
 * Replacement for vStringPut that can handle c > 0xff
 */
extern void cppVStringPut (vString * string, const int c);

/* Notify the external parser state for the purpose of conditional
 * branch choice. The CXX parser stores the block level here. */
extern void cppPushExternalParserBlock(void);
extern void cppPopExternalParserBlock(void);

#define CPP_MACRO_REPLACEMENT_FLAG_VARARGS 1
#define CPP_MACRO_REPLACEMENT_FLAG_STRINGIFY 2

typedef struct sCppMacroReplacementPartInfo {
	int parameterIndex; /* -1 if this part is a constant */
	int flags;
	vString * constant; /* not NULL only if parameterIndex != -1 */
	struct sCppMacroReplacementPartInfo * next;
} cppMacroReplacementPartInfo;

typedef struct sCppMacroInfo {
	char *name;			/* the name of macro. Useful for debugging. */
	bool hasParameterList; /* true if the macro has a trailing () */
	cppMacroReplacementPartInfo * replacements;
	int useCount;
	struct sCppMacroInfo * next;
} cppMacroInfo;

extern cppMacroInfo * cppFindMacro (const char *const name);
extern void cppUngetStringBuiltByMacro (const char * string,int len, cppMacroInfo *macro);

/*
* Build a replacement string for the specified macro.
* If the macro has parameters, they will be used.
* Parameters not found in the list will be assumed to be empty.
* May return NULL or equivalently an empty replacement string.
*/
extern vString * cppBuildMacroReplacement(
		const cppMacroInfo * macro,
		const char ** parameters, /* may be NULL */
		int parameterCount
	);

/* Do the same as cppBuildMacroReplacement with ptrArray<const char*>,
 * and unget the result of expansion to input cpp stream. */
extern void cppBuildMacroReplacementWithPtrArrayAndUngetResult(
		cppMacroInfo * macro,
		const ptrArray * args);

#ifdef DEBUG
extern void cppDebugPutc (const int level, const int c);
#endif

#endif  /* CTAGS_MAIN_GET_H */
